ZP-935 Check if ASDevice changed before saving it.

Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/utils/zpushadmin.php

@@ -342,6 +342,10 @@ class ZPushAdmin {
                 ZLog::Write(LOGLEVEL_DEBUG, sprintf("ZPushAdmin::ResyncFolder(): folder '%s' on device '%s' of user '%s' marked to be re-synchronized.", $folderid, $devid, $user));
             }
 
+            if ($device->GetData() === false) {
+                ZLog::Write(LOGLEVEL_DEBUG, sprintf("ZPushAdmin::ResyncFolder(): nothing changed for device '%s' of user '%s'", $devid, $user));
+                return false;
+            }
             ZPush::GetStateMachine()->SetState($device->GetData(), $devid, IStateMachine::DEVICEDATA);
             ZLog::Write(LOGLEVEL_DEBUG, sprintf("ZPushAdmin::ResyncFolder(): saved updated device data of device '%s' of user '%s'", $devid, $user));
         }